Donor challenge: Your generous donation will be matched 2-to-1 right now. Your $5 becomes $15! Dear Internet Archive Supporter,. I ask only. Making a Transistor Radio [G.C. Dobbs, B.H. Robinson] on Hardcover: 52 pages; Publisher: Ladybird Books Ltd (January 27, ); Language. Making a Transistor Radio – Ladybird Book. Making a Transistor Radio Book Cover. Making a transistor radio is a book written by G.C. Dobbs, with illustrations .
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With laybird one, small project and a bit of his time, I was left with a lifelong love for electronics and a skill that I have used ever since. Transistog got this book which I still have, and now show to my university students when I my family spent my Grade 3 year in Scotland in While making up raddio kit I found some other interesting things to do with the substitute parts list which is in the back cover of the book.
Before you complain that I used the wrong type, the parts list text says that you can use any red spot audio transistor. I was 11 and my school had a book savings scheme. Every school day… I can still tie my tie asleep, hungover, you name it.
Later the enamel must be scraped off so Shat connections can be made. Plywood, assorted nails and screws, tinfoil and a small box of precious components pulled from dead radios.
The tuning should be sharp enough to tune in individual stations without the background sounds of other stations. The bottom panel is the same size as the circuit board and the measurements for the end panels arc shown opposite. You are here to learn about electronics, not to be reminded that you are a child.
Very similar in design, line drawings and black and white. The positions of the com- ponerus on the circuit diagram do not normally corres- pond to their actual positions in the completed equip- ment, Sometimes a layout diagram is also used to show where to position the components on a base board.
This is done to adjust the voltages and flow oT current at various places in a circuit. As we have read on page 6. Poten- tiometers are often used, as in his case, as volume controls, A capacitor is a component which allows the signal to pass but not he fixed voltages used to power a circuit.
Sometimes this is not obvious, but follow the circuit and layout diagrams with care to avoid mistakes. Stretch the wire until the free end lightly touches the coke. When you open the book, the first thing you see sets the tone, for there is a guide to soldering on the inside of the front cover. Ferrite is iron dust stuck together. trandistor
You can tell which end is really anode or cathode by looking carefully to see which end the point contact wire is attached to, and which has the germanium crystal on a little mount. The rows should be an inch -and – a-half apart.
A pocket knife is useful for scraping the ends or the wire to clean rafio before the connections are made. One end kadybird marked either with a red band or a H sign, and this side goes to the positive side of the circuit. When radio waves carrying an audio frequency arrive at a receiver, three things happen: All three connections to the coil are now used, and if the wires are not placed in the correct positions, regeneration will not occur. Although he final radio which we will make will not need an aerial and earth, the crystal set relies on the electrical current set tip between a good trandistor and earth to work well, A suitable aerial can be made from inexpensive PVC covered copper wire.
Later I got the Radio Shack in-1 electronics lab, and with the radio in that kit I was able to pick up the stations in Sacramento. Woolworths produced a series of these, I found a mention of them here: Connect the red battery con- transisfor lead to screw 5, and the black lead to screw G, The radio is switched on by pushing the connector into place on top of the battery. I saved 20p a each week for a couple of months to buy it. If you were introduced to electronics by this book, let us know in the comments.
The symptom in my set was very low audio level mxking could only just be heard when the r.
When purchasing this, you should ask for a crysial earpiece. Search the history of over billion web pages on the Internet. Passing signals back again like this is called feedback.
As an exercise the book takes a brief diversion into home-made radios as created by WW2 prisoners of war with a detector made from a piece of coke. The greater the signal reaching this transistor, the louder will be its output.
This additional transistor will greatly increase the volume, enough to drive a loudspeaker, which is the next addition. We therefore need some sort of filter — to allow only one radio station to be received at once. With this biok you will learn, stage by stage, how to build more than one simple receiver.
The diode is removed Lo become one of Lhe two diodes in the new stage. The screws are No, 6 brass countersunk, half inch screws and the washers are No. We had a copy in my class when I was 10! But on the side I still hack analog and digital circuits, sometimes they even work.
Likewise here, with credit similarly going to my own Dad.
The radio frequency carrier wave is picked up by the aerial.